Phylum Mollusc Test Review

Which of the following is NOT a part of class Cephalopoda?

• chitons

• octopuses

• nautiluses

• cuttlefish

What is unique about class Cephalopoda?

• They are the least complex mollusc.

• They all have shells.

• They are the most complex mollusc.

• Only mollusc with siphons.

The only living cephalopods that possess an external shell are the

• cuttlefish

• nautiluses

• scallops

• mussels

Unlike other molluscs, the cephalopods have a _________________ circulatory system.

• open

• duplicate

• nonexistent

• closed

The similarity of design between the eyes of vertebrates and the eyes of many cephalopods provides an

excellent example of

• adaptive radiation

• natural selection

• convergent evolution

• divergent evolution

Pigment cells of cephalopods are called

• chromatophores.

• pigmentophores.

• wavelength-selective cytes

• melanocytes

Chitons belong to the molluscan class

• Cephalpoda

• Bivalvia

• Polyplacophora.

• Gastropoda

The oldest part of the bivalve shell is the

• umbo

• mantle

• radula

• adductor muscles

Which of the following is NOT a member of the class Bivalvia?

• mussels

• clams

• oysters

• octopus

The adaptation of bivalves to sedentary, filter feeding life-styles involved loss of the __________ and the radula.

• head

• foot

• siphon

• visceral mass